Jim, have only now got round to doing what you suggested. I spent an hour shaping plastic cards to try and get the back off to no avail. Then I reread your post and had it off in seconds.I have exposed the bottom part of the logic board but do not know which wires to pull. Can you help again?

Thanks for that. Will have a look tomorrow, best in daylight. I have just noticed something strange:When I use a USB stick it lights up and the machine is accessing it. So there is power there.But when I connect the keyboard to the same port there is no power as the Shift key does not light up. Have 2 keyboards and both same and they work fine on my 17"

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